mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2024-12-26 13:28:22 +01:00
Expose CMap in TrueType files
This commit is contained in:
Michael R Sweet
parent
4f5825b3d6
commit
9ec7c8bde9
@ -1277,12 +1277,14 @@ pdfioFileCreateFontObjFromFile(
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if ((file_obj = pdfioFileCreateObj(pdf, file)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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if ((st = pdfioObjCreateStream(file_obj, PDFIO_FILTER_FLATE)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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@ -1291,6 +1293,7 @@ pdfioFileCreateFontObjFromFile(
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{
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if (!pdfioStreamWrite(st, buffer, (size_t)bytes))
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{
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ttfDelete(font);
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close(fd);
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pdfioStreamClose(st);
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return (NULL);
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@ -1347,11 +1350,83 @@ pdfioFileCreateFontObjFromFile(
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if (unicode)
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{
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// Unicode (CID) font...
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pdfio_dict_t *cid2gid; // CIDToGIDMap dictionary
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pdfio_obj_t *cid2gid_obj; // CIDToGIDMap object
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size_t i, // Looping var
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num_cmap; // Number of CMap entries
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const int *cmap; // CMap entries
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unsigned char *bufptr, // Pointer into buffer
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*bufend; // End of buffer
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pdfio_dict_t *type2; // CIDFontType2 font dictionary
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pdfio_obj_t *type2_obj; // CIDFontType2 font object
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pdfio_array_t *descendants; // Decendant font list
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pdfio_dict_t *sidict; // CIDSystemInfo dictionary
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// Create a CIDToGIDMap object for the Unicode font...
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if ((cid2gid = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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pdfioDictSetName(cid2gid, "Filter", "FlateDecode");
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if ((cid2gid_obj = pdfioFileCreateObj(pdf, cid2gid)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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if ((st = pdfioObjCreateStream(cid2gid_obj, PDFIO_FILTER_FLATE)) == NULL)
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{
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ttfDelete(font);
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return (NULL);
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}
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cmap = ttfGetCMap(font, &num_cmap);
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for (i = 0, bufptr = buffer, bufend = buffer + sizeof(buffer); i < num_cmap; i ++)
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{
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if (cmap[i] < 0)
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{
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// Map undefined glyph to .notdef...
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*bufptr++ = 0;
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*bufptr++ = 0;
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}
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else
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{
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// Map to specified glyph...
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*bufptr++ = (unsigned char)(cmap[i] >> 8);
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*bufptr++ = (unsigned char)(cmap[i] & 255);
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}
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if (bufptr >= bufend)
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{
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// Flush buffer...
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if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
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{
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pdfioStreamClose(st);
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ttfDelete(font);
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return (NULL);
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}
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bufptr = buffer;
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}
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}
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if (bufptr > buffer)
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{
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// Flush buffer...
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if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
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{
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pdfioStreamClose(st);
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ttfDelete(font);
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return (NULL);
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}
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}
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pdfioStreamClose(st);
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// Create a CIDFontType2 dictionary for the Unicode font...
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if ((type2 = pdfioDictCreate(pdf)) == NULL)
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{
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@ -1375,7 +1450,7 @@ pdfioFileCreateFontObjFromFile(
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pdfioDictSetName(type2, "Subtype", "CIDFontType2");
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pdfioDictSetName(type2, "BaseFont", basefont);
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pdfioDictSetDict(type2, "CIDSystemInfo", sidict);
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pdfioDictSetName(type2, "CIDToGIDMap", "Identity");
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pdfioDictSetObj(type2, "CIDToGIDMap", cid2gid_obj);
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pdfioDictSetObj(type2, "FontDescriptor", desc_obj);
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if ((type2_obj = pdfioFileCreateObj(pdf, type2)) == NULL)
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185
ttf.c
185
ttf.c
@ -195,6 +195,8 @@ struct _ttf_s
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bool is_fixed; // Is this a fixed-width font?
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int max_char, // Last character in font
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min_char; // First character in font
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size_t num_cmap; // Number of entries in glyph map
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int *cmap; // Unicode character to glyph map
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_ttf_metric_t *widths[TTF_FONT_MAX_CHAR / 256];
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// Character metrics (sparse array)
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float units; // Width units
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@ -283,7 +285,7 @@ typedef struct _ttf_off_post_s // PostScript information
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static char *copy_name(ttf_t *font, unsigned name_id);
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static void errorf(ttf_t *font, const char *message, ...) TTF_FORMAT_ARGS(2,3);
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static int read_cmap(ttf_t *font, int **cmap);
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static bool read_cmap(ttf_t *font);
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static bool read_head(ttf_t *font, _ttf_off_head_t *head);
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static bool read_hhea(ttf_t *font, _ttf_off_hhea_t *hhea);
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static _ttf_metric_t *read_hmtx(ttf_t *font, _ttf_off_hhea_t *hhea);
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@ -309,9 +311,7 @@ ttfCreate(const char *filename, // I - Filename
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void *err_data) // I - Error callback data
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{
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ttf_t *font = NULL; // New font object
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int i, // Looping var
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num_cmap, // Number of Unicode character to glyph mappings
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*cmap = NULL; // Unicode character to glyph mappings
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size_t i; // Looping var
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_ttf_metric_t *widths = NULL; // Glyph metrics
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_ttf_off_head_t head; // head table
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_ttf_off_hhea_t hhea; // hhea table
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@ -375,7 +375,7 @@ ttfCreate(const char *filename, // I - Filename
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TTF_DEBUG("ttfCreate: italic_angle=%g\n", font->italic_angle);
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TTF_DEBUG("ttfCreate: is_fixed=%s\n", font->is_fixed ? "true" : "false");
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if ((num_cmap = read_cmap(font, &cmap)) <= 0)
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if (!read_cmap(font))
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goto error;
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if (!read_head(font, &head))
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@ -457,18 +457,18 @@ ttfCreate(const char *filename, // I - Filename
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// Build a sparse glyph widths table...
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font->min_char = -1;
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for (i = 0; i < num_cmap; i ++)
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for (i = 0; i < font->num_cmap; i ++)
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{
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if (cmap[i] >= 0)
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if (font->cmap[i] >= 0)
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{
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int bin = i / 256, // Sub-array bin
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glyph = cmap[i]; // Glyph index
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int bin = (int)i / 256, // Sub-array bin
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glyph = font->cmap[i]; // Glyph index
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// Update min/max...
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if (font->min_char < 0)
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font->min_char = i;
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font->min_char = (int)i;
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font->max_char = i;
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font->max_char = (int)i;
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// Allocate a sub-array as needed...
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if (!font->widths[bin])
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@ -484,7 +484,6 @@ ttfCreate(const char *filename, // I - Filename
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}
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// Cleanup and return the font...
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free(cmap);
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free(widths);
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return (font);
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@ -492,7 +491,6 @@ ttfCreate(const char *filename, // I - Filename
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// If we get here something bad happened...
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error:
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free(cmap);
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free(widths);
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ttfDelete(font);
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@ -527,6 +525,8 @@ ttfDelete(ttf_t *font) // I - Font
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free(font->names.names);
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free(font->names.storage);
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free(font->cmap);
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for (i = 0; i < 256; i ++)
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free(font->widths[i]);
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@ -582,6 +582,28 @@ ttfGetCapHeight(ttf_t *font) // I - Font
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}
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//
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// 'ttfGetCMap()' - Get the Unicode to glyph mapping table.
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//
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const int * // O - CMap table
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ttfGetCMap(ttf_t *font, // I - Font
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size_t *num_cmap) // O - Number of entries in table
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{
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// Range check input...
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if (!font || !num_cmap)
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{
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if (num_cmap)
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*num_cmap = 0;
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return (NULL);
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}
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*num_cmap = font->num_cmap;
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return (font->cmap);
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}
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//
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// 'ttfGetCopyright()' - Get the copyright text for a font.
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//
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@ -1019,15 +1041,13 @@ errorf(ttf_t *font, // I - Font
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* 'read_cmap()' - Read the cmap table, getting the Unicode mapping table.
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*/
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static int // O - Number of cmap entries or -1 on error
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read_cmap(ttf_t *font, // I - Font
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int **cmap) // O - cmap entries
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static bool // O - `true` on success, `false` on error
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read_cmap(ttf_t *font) // I - Font
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{
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unsigned length; // Length of cmap table
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int i, // Looping var
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temp, // Temporary value
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num_tables, // Number of cmap tables
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num_cmap = 0, // Number of cmap entries
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platform_id, // Platform identifier (Windows or Mac)
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encoding_id, // Encoding identifier (varies)
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cformat; // Formap of cmap data
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@ -1075,23 +1095,20 @@ read_cmap(ttf_t *font, // I - Font
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#endif /* 0 */
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// Clear character map...
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*cmap = NULL;
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// Find the cmap table...
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if (seek_table(font, TTF_OFF_cmap, 0, true) == 0)
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return (-1);
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return (false);
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if ((temp = read_ushort(font)) != 0)
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{
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errorf(font, "Unknown cmap version %d.", temp);
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return (-1);
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return (false);
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}
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if ((num_tables = read_ushort(font)) < 1)
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{
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errorf(font, "No cmap tables to read.");
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return (-1);
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return (false);
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}
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TTF_DEBUG("read_cmap: num_tables=%d\n", num_tables);
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@ -1122,17 +1139,17 @@ read_cmap(ttf_t *font, // I - Font
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else
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{
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errorf(font, "No usable cmap table.");
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return (-1);
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return (false);
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}
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}
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if ((length = seek_table(font, TTF_OFF_cmap, coffset, true)) == 0)
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return (-1);
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return (false);
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if ((cformat = read_ushort(font)) < 0)
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{
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errorf(font, "Unable to read cmap table format at offset %u.", coffset);
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return (-1);
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return (false);
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}
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TTF_DEBUG("read_cmap: cformat=%d\n", cformat);
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@ -1144,22 +1161,40 @@ read_cmap(ttf_t *font, // I - Font
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// Format 0: Byte encoding table.
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//
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// This is a simple 8-bit mapping.
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size_t j; // Looping var
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unsigned char bmap[256]; // Byte map buffer
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if ((unsigned)read_ushort(font) == (unsigned)-1)
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{
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errorf(font, "Unable to read cmap table length at offset %u.", coffset);
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return (-1);
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return (false);
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}
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/* language = */ read_ushort(font);
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num_cmap = (int)length - 6;;
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*cmap = (int *)malloc((size_t)num_cmap * sizeof(int));
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if (length > (256 + 6))
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{
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errorf(font, "Bad cmap table length at offset %u.", coffset);
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return (false);
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}
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if (read(font->fd, *cmap, (size_t)num_cmap) != (ssize_t)num_cmap)
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font->num_cmap = length - 6;
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if ((font->cmap = (int *)malloc(font->num_cmap * sizeof(int))) == NULL)
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{
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errorf(font, "Unable to allocate cmap table.");
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return (false);
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}
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if (read(font->fd, bmap, font->num_cmap) != (ssize_t)font->num_cmap)
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{
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errorf(font, "Unable to read cmap table length at offset %u.", coffset);
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return (-1);
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return (false);
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}
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// Copy into the actual cmap table...
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for (j = 0; j < font->num_cmap; j ++)
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font->cmap[j] = bmap[j];
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}
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break;
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@ -1184,7 +1219,7 @@ read_cmap(ttf_t *font, // I - Font
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if ((clength = (unsigned)read_ushort(font)) == (unsigned)-1)
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{
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errorf(font, "Unable to read cmap table length at offset %u.", coffset);
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return (-1);
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return (false);
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}
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TTF_DEBUG("read_cmap: clength=%u\n", clength);
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@ -1200,13 +1235,21 @@ read_cmap(ttf_t *font, // I - Font
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if (segCount < 2)
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{
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errorf(font, "Bad cmap table.");
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return (-1);
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return (false);
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}
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numGlyphIdArray = ((int)clength - 8 * segCount - 16) / 2;
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segments = (_ttf_off_cmap4_t *)calloc((size_t)segCount, sizeof(_ttf_off_cmap4_t));
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glyphIdArray = (int *)calloc((size_t)numGlyphIdArray, sizeof(int));
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if (!segments || !glyphIdArray)
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{
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errorf(font, "Unable to allocate memory for cmap.");
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free(segments);
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free(glyphIdArray);
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return (false);
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}
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TTF_DEBUG("read_cmap: numGlyphIdArray=%d\n", numGlyphIdArray);
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for (i = 0; i < segCount; i ++)
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@ -1238,10 +1281,18 @@ read_cmap(ttf_t *font, // I - Font
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// uncompressed cmap table...
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segCount --; // Last segment is not used (sigh)
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num_cmap = segments[segCount - 1].endCode + 1;
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cmapptr = *cmap = (int *)malloc((size_t)num_cmap * sizeof(int));
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font->num_cmap = segments[segCount - 1].endCode + 1;
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font->cmap = cmapptr = (int *)malloc(font->num_cmap * sizeof(int));
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memset(cmapptr, -1, (size_t)num_cmap * sizeof(int));
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if (!font->cmap)
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{
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errorf(font, "Unable to allocate memory for cmap.");
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free(segments);
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free(glyphIdArray);
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return (false);
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}
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memset(cmapptr, -1, font->num_cmap * sizeof(int));
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// Now loop through the segments and assign glyph indices from the
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// array...
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@ -1293,7 +1344,7 @@ read_cmap(ttf_t *font, // I - Font
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if (read_ulong(font) == 0)
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{
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errorf(font, "Unable to read cmap table length at offset %u.", coffset);
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return (-1);
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return (false);
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}
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/* language = */ read_ulong(font);
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@ -1301,25 +1352,36 @@ read_cmap(ttf_t *font, // I - Font
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TTF_DEBUG("read_cmap: nGroups=%u\n", nGroups);
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groups = (_ttf_off_cmap12_t *)calloc(nGroups, sizeof(_ttf_off_cmap12_t));
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if ((groups = (_ttf_off_cmap12_t *)calloc(nGroups, sizeof(_ttf_off_cmap12_t))) == NULL)
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{
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errorf(font, "Unable to allocate memory for cmap.");
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return (false);
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}
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for (gidx = 0, group = groups, num_cmap = 0; gidx < nGroups; gidx ++, group ++)
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for (gidx = 0, group = groups, font->num_cmap = 0; gidx < nGroups; gidx ++, group ++)
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{
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group->startCharCode = read_ulong(font);
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group->endCharCode = read_ulong(font);
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group->startGlyphID = read_ulong(font);
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TTF_DEBUG("read_cmap: [%u] startCharCode=%u, endCharCode=%u, startGlyphID=%u\n", gidx, group->startCharCode, group->endCharCode, group->startGlyphID);
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if (group->endCharCode >= (unsigned)num_cmap)
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num_cmap = (int)group->endCharCode + 1;
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if (group->endCharCode >= font->num_cmap)
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font->num_cmap = group->endCharCode + 1;
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}
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// Based on the end code of the segent table, allocate space for the
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// uncompressed cmap table...
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TTF_DEBUG("read_cmap: num_cmap=%u\n", (unsigned)num_cmap);
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cmapptr = *cmap = (int *)malloc((size_t)num_cmap * sizeof(int));
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TTF_DEBUG("read_cmap: num_cmap=%u\n", (unsigned)font->num_cmap);
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font->cmap = cmapptr = (int *)malloc(font->num_cmap * sizeof(int));
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memset(cmapptr, -1, (size_t)num_cmap * sizeof(int));
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if (!font->cmap)
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{
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errorf(font, "Unable to allocate memory for cmap.");
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free(groups);
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return (false);
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}
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|
||||
memset(cmapptr, -1, font->num_cmap * sizeof(int));
|
||||
|
||||
// Now loop through the groups and assign glyph indices from the
|
||||
// array...
|
||||
@ -1352,7 +1414,7 @@ read_cmap(ttf_t *font, // I - Font
|
||||
if (read_ulong(font) == 0)
|
||||
{
|
||||
errorf(font, "Unable to read cmap table length at offset %u.", coffset);
|
||||
return (-1);
|
||||
return (false);
|
||||
}
|
||||
|
||||
/* language = */ read_ulong(font);
|
||||
@ -1360,25 +1422,36 @@ read_cmap(ttf_t *font, // I - Font
|
||||
|
||||
TTF_DEBUG("read_cmap: nGroups=%u\n", nGroups);
|
||||
|
||||
groups = (_ttf_off_cmap13_t *)calloc(nGroups, sizeof(_ttf_off_cmap13_t));
|
||||
if ((groups = (_ttf_off_cmap13_t *)calloc(nGroups, sizeof(_ttf_off_cmap13_t))) == NULL)
|
||||
{
|
||||
errorf(font, "Unable to allocate memory for cmap.");
|
||||
return (false);
|
||||
}
|
||||
|
||||
for (gidx = 0, group = groups, num_cmap = 0; gidx < nGroups; gidx ++, group ++)
|
||||
for (gidx = 0, group = groups, font->num_cmap = 0; gidx < nGroups; gidx ++, group ++)
|
||||
{
|
||||
group->startCharCode = read_ulong(font);
|
||||
group->endCharCode = read_ulong(font);
|
||||
group->glyphID = read_ulong(font);
|
||||
TTF_DEBUG("read_cmap: [%u] startCharCode=%u, endCharCode=%u, glyphID=%u\n", gidx, group->startCharCode, group->endCharCode, group->glyphID);
|
||||
|
||||
if (group->endCharCode >= (unsigned)num_cmap)
|
||||
num_cmap = (int)group->endCharCode + 1;
|
||||
if (group->endCharCode >= font->num_cmap)
|
||||
font->num_cmap = group->endCharCode + 1;
|
||||
}
|
||||
|
||||
// Based on the end code of the segent table, allocate space for the
|
||||
// uncompressed cmap table...
|
||||
TTF_DEBUG("read_cmap: num_cmap=%u\n", (unsigned)num_cmap);
|
||||
cmapptr = *cmap = (int *)malloc((size_t)num_cmap * sizeof(int));
|
||||
TTF_DEBUG("read_cmap: num_cmap=%u\n", (unsigned)font->num_cmap);
|
||||
font->cmap = cmapptr = (int *)malloc(font->num_cmap * sizeof(int));
|
||||
|
||||
memset(cmapptr, -1, (size_t)num_cmap * sizeof(int));
|
||||
if (!font->cmap)
|
||||
{
|
||||
errorf(font, "Unable to allocate cmap.");
|
||||
free(groups);
|
||||
return (false);
|
||||
}
|
||||
|
||||
memset(cmapptr, -1, font->num_cmap * sizeof(int));
|
||||
|
||||
// Now loop through the groups and assign glyph indices from the
|
||||
// array...
|
||||
@ -1395,19 +1468,19 @@ read_cmap(ttf_t *font, // I - Font
|
||||
|
||||
default :
|
||||
errorf(font, "Format %d cmap tables are not yet supported.", cformat);
|
||||
return (-1);
|
||||
return (false);
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
cmapptr = *cmap;
|
||||
for (i = 0; i < num_cmap && i < 127; i ++)
|
||||
cmapptr = font->cmap;
|
||||
for (i = 0; i < (int)font->num_cmap && i < 127; i ++)
|
||||
{
|
||||
if (cmapptr[i] >= 0)
|
||||
TTF_DEBUG("read_cmap; cmap[%d]=%d\n", i, cmapptr[i]);
|
||||
}
|
||||
#endif // DEBUG
|
||||
|
||||
return (num_cmap);
|
||||
return (true);
|
||||
}
|
||||
|
||||
|
||||
|
||||
1
ttf.h
1
ttf.h
@ -90,6 +90,7 @@ extern void ttfDelete(ttf_t *font);
|
||||
extern int ttfGetAscent(ttf_t *font);
|
||||
extern ttf_rect_t *ttfGetBounds(ttf_t *font, ttf_rect_t *bounds);
|
||||
extern int ttfGetCapHeight(ttf_t *font);
|
||||
extern const int *ttfGetCMap(ttf_t *font, size_t *num_cmap);
|
||||
extern const char *ttfGetCopyright(ttf_t *font);
|
||||
extern int ttfGetDescent(ttf_t *font);
|
||||
extern ttf_rect_t *ttfGetExtents(ttf_t *font, float size, const char *s, ttf_rect_t *extents);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user